function Getcustom(length) {
    let characters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890";
    let result = '';
    for (let i = 0; i < length; i++) {
        const randomIndex = Math.floor(Math.random() * characters.length);
        result += characters.charAt(randomIndex);
    }
    return result;
}


console.log(Getcustom(11))
